CN101958810B - Method and system used for realizing fault positioning of intermediate node autonomously - Google Patents
Method and system used for realizing fault positioning of intermediate node autonomously Download PDFInfo
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- CN101958810B CN101958810B CN 201010521265 CN201010521265A CN101958810B CN 101958810 B CN101958810 B CN 101958810B CN 201010521265 CN201010521265 CN 201010521265 CN 201010521265 A CN201010521265 A CN 201010521265A CN 101958810 B CN101958810 B CN 101958810B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0677—Localisation of faults
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/12—Network monitoring probes
Abstract
The embodiment of the invention provides a method and a system used for realizing fault positioning of an intermediate node automatically. The intermediate node is used for forwarding a message between a first end node and a second end node. The method comprises the following steps of: constructing a test message and sending the test message to the first end node, wherein the test message protects the information of the address of the second end node and is used for triggering the first end node to send a response message to the second end node; forwarding the response message from the first end node to the second end node; performing packet capture on the response message; and analyzing whether the message from the first end node to the second end node can be forwarded normally according to a packet capture result. In scene of a hybrid network of equipment of a plurality of manufacturers, the fault positioning can be finished by using the intermediate node of a single manufacturer by adopting the technical scheme of the embodiment of the invention so as to improve fault maintenance efficiency and ensure data transfer quality.
Description
Technical field
The present invention relates to the Internet Transmission field, particularly independently realize the method and system of fault location for the intermediate node of link.
Background technology
Along with the development of the communication technology, how to ensure that the data delivery quality becomes problem demanding prompt solution.An aspect that ensures the data delivery quality is when the data transmission goes wrong, and is unintelligible etc. such as call voice, how to detect rapidly link failure, and carries out fault location, in order to link is safeguarded.
Fig. 1 illustrates a kind of common composition form of link.See also Fig. 1, router C, H, E form link.Wherein, router C, E are the end node (End Node, EN) of link, and router H is the intermediate node (Intermediate Node, IN) of link.One data transfer is to send data from the source node to begin to be received and finish by the destination node is all correct to data.In the process of transfer of data, the user finds to occur between router C, the E problem of end-to-end link Quality Down, and such as data delay or packet loss etc. needs to judge whether link-quality descends relevant with router H.
In order to address the above problem, can be initiated respectively by router H the operation of ping C and ping E.Ping is whether normal technology of a kind of checking passage and equipment.From router H ping node C, namely send N ICMP bag A from router H, behind the arrival node C, node C send N bag A ' to postbacking.From router H ping node E, namely send M ICMP bag B from router H, behind the arrival node E, node E send M bag B ' (wherein, N and M are natural number) to postbacking.
Adopt such scheme, the message of two ping operations is in the path of router H device interior process, and incomplete same in the path of router H device interior process through node C and the message between the node E that router H transmits, therefore, above-mentioned ping result can't judge whether link-quality descends relevant with router H.
Summary of the invention
The embodiment of the invention provides and has been used for the method and system that intermediate node is independently realized fault location, and individual node can independently be finished fault location, thereby improves the efficient of Breakdown Maintenance, and then ensures the data delivery quality.
According to an aspect of the embodiment of the invention, provide a kind of and independently realized the method for fault location for intermediate node, described intermediate node is used for transmitting the message between first end node and the second end node, and the method comprises:
Make up and send test packet to described first end node, described test packet comprises the information of described the second end node address, and described test packet is used for triggering described first end node and sends response message to described the second end node;
To be transmitted to from the response message of described first end node described the second end node;
Described response message is carried out packet capturing;
Whether can normally transmit message from described first end node to described the second end node according to the packet capturing interpretation of result.
According to another aspect of the embodiment of the invention, provide a kind of and independently realized the system of fault location for intermediate node, described intermediate node is used for transmitting the message between first end node and the second end node, and this system comprises:
Construction unit is used for making up and sending test packet to the first end node, and described test packet comprises the information of described the second end node address, and described test packet is used for triggering described first end node and sends response message to the second end node;
Retransmission unit is used for being transmitted to from the response message of described first end node described the second end node;
The packet capturing unit is used for described response message is carried out packet capturing;
Analytic unit is for the message that whether can normally transmit according to the packet capturing interpretation of result from described first end node to described the second end node.
In the embodiment of the invention, do not rely on the end node of link, the intermediate node by link produces test packet from master control, and this test packet trigger end node generates the response message to peer node, and intermediate node is transmitted response message.Response message is identical at the forward-path of the inner process of intermediate node with corresponding end to end service message at the forward-path of the inner process of intermediate node, therefore, can judge that to the packet capturing analysis result of response message whether intermediate node can normally transmit end to end message, finishes fault location.In the scene of many producers equipment mixed networking, adopt the technical scheme of the embodiment of the invention, can finish fault location by the intermediate node of single producer, thereby improve the efficient of Breakdown Maintenance, and then ensure the data delivery quality.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the below will do to introduce simply to the accompanying drawing of required use among the embodiment.Apparently, the accompanying drawing that the following describes only is some embodiments of the present invention, for the ordinary skill human eye, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 illustrates the structural representation of a kind of common composition form of link;
Fig. 2 illustrates and is used for the schematic flow sheet that intermediate node is independently realized the method for fault location in the embodiment of the invention;
Fig. 3 illustrates the structural representation of a kind of link packet capturing in the embodiment of the invention;
Fig. 4 illustrates and is used for the schematic flow sheet that intermediate node is independently realized the method for fault location in the embodiment of the invention one;
Fig. 5 illustrates and is used for the schematic flow sheet that intermediate node is independently realized the method for fault location in the embodiment of the invention two;
Fig. 6 illustrates and is used for the schematic flow sheet that intermediate node is independently realized the method for fault location in the embodiment of the invention three;
Fig. 7 illustrates and is used for the structural representation that intermediate node is independently realized the system of fault location in the embodiment of the invention.
Embodiment
The technical scheme of the embodiment of the invention is used for carrying out the link failure location.In order to realize transfer of data at network, defined two category nodes, end node (End Node, EN) and intermediate node (Intermediate Node, IN), end node and intermediate node form link jointly.One data transfer is to begin to be received and finish by the destination node is all correct to data from the source node, intermediate node provides data retransmission and Route Selection service for transfer of data end to end, i.e. the data communication device that sends of the source node forwarding of crossing each intermediate node arrives the destination node.The system of the terminal that wherein forms the end node of link and intermediate node and can be multiple network element and/or integrated network element and network element is operated, wherein network element can include but not limited to router, main frame, gateway, switch etc.In following examples, when intermediate node was network element, the packet capturing function was integrated on the network element; When intermediate node is to comprise network element and during the system of terminal that network element is operated, the packet capturing function can be integrated on the terminal that network element is operated.
Consult Fig. 2, the embodiment of the invention provides a kind of and independently realizes the method for fault location for intermediate node, and intermediate node is used for transmitting the message between first end node and the second end node, and the method specifically can comprise:
Send test packet at step 201. intermediate node structure and to the first end node, test packet comprises the information of the second end node address, test packet is used for triggering the first end node and sends response message to the second end node, wherein response message comprises the information of destination address, and destination address is the second end node address.
Concrete, test packet can be the message of common type in the existing IP network, for example can include but not limited to be ping message or address resolution protocol (Address Resolution Protocol, ARP) message.
Intermediate node can make up polytype test packet.For example, in one embodiment of this invention, test packet comprises the information of the second end node address and first end node address, and the second end node address is as the source address of test packet, the first end node address destination address as test packet.In another embodiment of the present invention, test packet comprises the information of the second end node address, and the second end node address is as the destination address of test packet.
The mode that intermediate node sends test packet also can have multiple.In one embodiment of this invention, when the destination address of test packet is the first end node address, directly test packet is sent to the first end node.In another embodiment of the present invention, when the destination address of test packet is the second end node address, by specifying outgoing interface test packet is sent to the first end node.
To be transmitted to from the response message of first end node the second end node at step 202. intermediate node.
Response message is identical at the forward-path of the inner process of intermediate node with corresponding end to end service message at the forward-path of the inner process of intermediate node, namely simulates end to end service message with response message in the present embodiment.
In another embodiment of the present invention, in order to improve the ability of intermediate node fault location, can be further arrange according to the feature of the service message end to end feature to response message.Concrete, can in step 201, make up in the test packet, test packet is configured, with the feature of control response message.The feature of response message can include but not limited to: priority, transmission frequency, length and/or five-tuple (source IP address, source port, purpose IP address, destination interface and protocol type).Test packet is configured that the content that can comprise test packet is configured and the transmission of test packet is configured.In one embodiment of this invention, the content of test packet is configured, for example can includes but not limited to that COS (Type Of Service, the TOS) field at test packet is carried the feature of wishing that response message has.In another embodiment of the present invention, the transmission of test packet is configured features such as the size that can include but not limited to test packet, frequency, port numbers, the correspondingly feature of control response message.
At step 203. intermediate node response message is carried out packet capturing.
Can carry out packet capturing according to the feature of response message type or response message.In an embodiment of the present invention, carrying out packet capturing according to the response message type, for example is to catch ping message or ARP message.In another embodiment of the present invention, carry out packet capturing according to the feature of response message, for example catch according to the difference of message length.
The packet capturing mode also can have multiple.In one embodiment of this invention, support the DEBUG pattern when intermediate node, open corresponding DEBUG and monitor, can catch specific bag (packet of message).In another embodiment of the present invention, when intermediate node is supported mirror image, the flow (inbound traffics, outflow) of certain port of intermediate node can be mirrored on the port that connects the packet capturing module, by the packet capturing of packet capturing module.Wherein, the packet capturing module has referred to install the module of packet catcher, and the packet capturing module integration is in intermediate node.The port of intermediate node includes but not limited to: the port that the port that intermediate node links to each other with the first end node, intermediate node link to each other with the second end node.
Whether can normally transmit message from the first end node to the second end node at step 204. intermediate node according to the packet capturing interpretation of result.
In an embodiment of the present invention, can judge whether intermediate node can normally transmit the message from the first end node to the second end node by the quantity and/or the time delay that receive and send response message.In another embodiment of the present invention, can whether can normally transmit message from the first end node to the second end node according to the judgement intermediate nodes such as cycle that receive and send response message.The foundation of judging can preset, for example: if receive and send the consistent or quantity difference of the quantity of response message in error range, then intermediate node can normally be transmitted the message from the first end node to the second end node, otherwise, then cannot normally transmit; If receive and send the time delay of response message in normal time delay scope, then intermediate node can normally be transmitted the message from the first end node to the second end node, otherwise, then cannot normally transmit; Etc..Can only set single parameter and satisfy condition namely and to judge and normally to transmit, also can set a plurality of parameters and satisfy respectively corresponding conditions and just can judge normal forwarding.
By whether can normally transmit the message from the first end node to the second end node to the packet capturing interpretation of result intermediate node of response message.In another embodiment of the present invention, in step 203, can also carry out packet capturing to test packet; Accordingly, the transmission delay that in step 204, whether has message according to packet capturing interpretation of result intermediate node and the link between the first end node to test packet and response message; And can analyze situations such as whether there being unusually distorting of message, ensure better data transmission quality.
Whether the fault that the method by the embodiment of the invention can send to the second end node message the first end node position relevant with intermediate node.In like manner, can adopt the method for the embodiment of the invention, whether the fault that the second end node is sent to the first end node message position relevant with intermediate node, and difference is that test packet sends to the second end node, and response message is to be forwarded to the first end node from the second end node.
In following examples, only with the end node network element, intermediate node is to comprise network element and the system of terminal that network element is operated is that example describes, and wherein network element is router.Intermediate node only is that the principle of network element is identical.
Embodiment one, see also Fig. 3, router C, H, E form link, router C, E are the end node of link, the intermediate node of link comprises router H and packet capturing module 301, and packet capturing module 301 is for having installed the main frame of packet capturing function, and packet capturing module 301 is used for the message on the router H is carried out packet capturing, the port that router H links to each other with router E is 302, and the port that router H links to each other with router C is 303.When the situation of end-to-end link Quality Down occurring between router C, the E, router H initiates fault location, judges whether link-quality descends relevant with intermediate node (router H).See also Fig. 4, the ping function that present embodiment adopts network element to support realizes that detailed process is as follows:
Be the ping message that router H makes up at step 401. test packet, router H sends to router E with the ping message, the ping message comprises source address and destination address information, and wherein source address is the IP address of router C, and destination address is the IP address of router E.
After step 402. router E received the ping message, according to the source address in the ping message, router E generated to the ping response message (being response message) of router C and sends to router H.
H is transmitted to router C with the ping response message at step 403. router.After router C receives the ping response message, can make discard processing according to agreement, normally not move thereby do not affect network.
Carry out packet capturing at step 404. intermediate node at the port that links to each other with router E.Concrete, the inbound traffics (being the ping response message) of the port 302 that router H is linked to each other with router E are mirrored on the packet capturing module 301, grasp the ping response messages by packet capturing module 301; Further, the outflow (being the ping message) of the port 302 that router H can also be linked to each other with router E is mirrored on the packet capturing module 301, by packet capturing module 301 crawl ping messages.
Carry out packet capturing at step 405. intermediate node at the port that links to each other with router C.Concrete, the outflow (being the ping response message) of the port 303 that router H is linked to each other with router C is mirrored on the packet capturing module 301, grasps the ping response messages by packet capturing module 301.
Wherein, step 404 can be after step 402, carry out (not shown among Fig. 4) before the step 403, also can with step 405, carry out simultaneously (not shown among Fig. 4) after step 403.Perhaps step 404 is carried out after step 403, before the step 405.
Can receive and send by intermediate node the contrast of the information such as quantity, time delay of ping response message, judge intermediate node whether normally forwarding router E to the message of router C.Further, the contrast of the information such as the quantity of the ping message that can also send by intermediate node and the ping response message of transmission, time delay, judge router H whether normally forwarding router E to the message of router C.In like manner, can verify intermediate node whether normally forwarding router C to the message of router E.
Embodiment two, and when the situation of end-to-end link Quality Down occurring between router C, the E, router H initiates fault location among Fig. 3, and the ping function that adopts network element to support judges whether link-quality descends relevant with intermediate node (router H).See also Fig. 5, detailed process is as follows:
Be the ping message that router H makes up at step 501. test packet, the ping message comprises destination address information, and wherein destination address is the IP address of router C.Router H is that the ping message is specified outgoing interface and the ping message is sent to router E.
After step 502. router E receives the ping message, search and transmit, router E is forwarded back to router H with the former road of ping message, and the ping message that is forwarded back to router H is response message.
At step 503. router H with the ping message repeating to C.
Carry out packet capturing at step 504. intermediate node at the port that links to each other with router E.
Carry out packet capturing at step 505. intermediate node at the port that links to each other with router C.
Embodiment three, when the situation of end-to-end link Quality Down occurring between router C, the E, initiate fault location by device H among Fig. 3, and the ARP function that adopts network element to support judges whether link-quality descends relevant with intermediate node (router H).See also Fig. 6, detailed process is as follows:
Be the ARP request message that router H makes up at step 601. test packet, intermediate node sends to router E with the ARP request message, the ARP request message comprises source address and destination address information, and wherein source address is the IP address of router C, and destination address is the IP address of router E.
After step 602. router E received the ARP request message, according to the ARP agreement, router E generated to the arp reply message (being response message) of router C and sends to router H.
At step 603. router H with the arp reply message repeating to router C.
Carry out packet capturing at step 604. intermediate node at the port that links to each other with router E.
Carry out packet capturing at step 605. intermediate nodes at the port that links to each other with route C.
In the scene of many producers equipment mixed networking, adopt the technical scheme of above embodiment, can finish fault location by the intermediate node of single producer.If asking of intermediate node can be carried out fault recovery fast, thus the efficient of raising Breakdown Maintenance, and then ensure the data delivery quality.If get rid of ask (for example being asking of end node) of intermediate node, can reduce the cost of equipment maintenance of intermediate node, improve the equipment degree of recognition to intermediate node.
The embodiment of the invention provides a kind of and independently realizes the system of fault location for intermediate node, and this system can be integrated in the intermediate node, and intermediate node is used for transmitting the message between first end node and the second end node.Consult Fig. 7, this system comprises:
Construction unit makes up and can have multiple to the mode that the first end node sends test packet:
In one embodiment of this invention, test packet comprises the information of source address and destination address, and source address is the second end node address, and destination address is the first end node address; Construction unit directly sends to test packet the first end node.
In another embodiment of the present invention, construction unit can comprise:
Make up subelement 7011, make up test packet, test packet comprises the information of destination address, and destination address is the second end node address.
Send subelement 7013, by outgoing interface test packet is sent to the first end node.
In one embodiment of this invention, the packet capturing unit can carry out packet capturing by the mode that DEBUG monitors.In another embodiment of the present invention, the packet capturing unit also can carry out packet capturing by the mode of mirror image.In the execution mode by the packet capturing of mirror image mode, the packet capturing unit can comprise:
The first packet capturing module is used at the port that links to each other with the first end node response message being carried out packet capturing;
The second packet capturing module is used at the port that links to each other with the second end node response message being carried out packet capturing.
In one embodiment of this invention, the first packet capturing module can comprise:
First mirror is used for the inbound traffics mirror image by the port that will link to each other with the first end node as submodule, the crawl response message.
In another embodiment of the present invention, the first packet capturing module can also comprise:
The second mirror image submodule is used for the outflow mirror image by the port that will link to each other with the first end node, the crawl test packet.
In one embodiment of this invention, the second packet capturing module can comprise:
The mirror image submodule is used for the outflow mirror image by the port that will link to each other with the second end node, the crawl response message.
More than by in the execution mode of mirror image mode packet capturing, can packet catcher be installed at intermediate node, the module that packet catcher has been installed on the intermediate node is called the packet capturing module.The crawl function of packet capturing unit and the analytic function of analytic unit can be integrated in the packet capturing module to be finished.
In the embodiment of the invention, construction unit produces test packet, and this test packet trigger end node generates the response message to peer node, and retransmission unit is transmitted response message.Response message is identical at the forward-path of the inner process of intermediate node with corresponding end to end service message at the forward-path of the inner process of intermediate node, therefore, analytic unit is analyzed according to the packet capturing result of packet capturing unit to response message, can judge whether intermediate node can normally transmit end to end message, thereby finish fault location.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware.Based on such understanding, technical scheme of the present invention is to can embodying with the form of software product in whole or in part that background technology is made contributions, this computer software product can be stored in the storage medium, such as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are used so that a computer equipment (can be personal computer, server or the network equipment etc.) is carried out the described method of some part of each embodiment of the present invention or embodiment.
More than disclosed only be several preferred implementation of the present invention, but protection scope of the present invention is not limited to this.Various modifications and distortion that any those skilled in the art of being familiar with make the present invention under the teaching of this paper all should be encompassed within protection scope of the present invention.
Claims (10)
1. one kind is used for the method that intermediate node is independently realized fault location, and described intermediate node is used for transmitting the message between first end node and the second end node, and the method comprises:
Described intermediate node makes up and sends test packet to described first end node, and described test packet comprises the information of described the second end node address, and described test packet is used for triggering described first end node and sends response message to described the second end node;
Described intermediate node will be transmitted to from the response message of described first end node described the second end node;
Described intermediate node carries out packet capturing to described response message;
Whether described intermediate node can normally transmit message from described first end node to described the second end node according to the packet capturing interpretation of result.
2. method according to claim 1, wherein, described test packet also comprises the information of first end node address, and described the second end node address is as the source address of described test packet, and described first end node address is as the destination address of described test packet.
3. method according to claim 1, wherein, described the second end node address is as the destination address of described test packet; Described structure also sends test packet to the first end node and comprises:
For described test packet is specified outgoing interface;
By described outgoing interface described test packet is sent to described first end node.
4. according to claim 1 to 3 each described methods, wherein, described test packet is ping message or address analysis protocol message.
5. method according to claim 1, wherein, described structure also sends test packet to the first end node and also comprises:
Described test packet is configured, to control the feature of described response message.
6. method according to claim 5, wherein, describedly described response message is carried out packet capturing comprise:
Feature according to described response message is carried out packet capturing.
7. according to claim 5 or 6 described methods, wherein, the feature of described response message comprises: priority, transmission frequency, length and/or five-tuple.
8. one kind is used for the system that intermediate node is independently realized fault location, and the described system integration is in described intermediate node, and described intermediate node is used for transmitting the message between first end node and the second end node, it is characterized in that this system comprises:
Construction unit is used for making up and sending test packet to the first end node, and described test packet comprises the information of described the second end node address, and described test packet is used for triggering described first end node and sends response message to the second end node;
Retransmission unit is used for being transmitted to from the response message of described first end node described the second end node;
The packet capturing unit is used for described response message is carried out packet capturing;
Analytic unit is for the message that whether can normally transmit according to the packet capturing interpretation of result from described first end node to described the second end node.
9. system according to claim 8, it is characterized in that, described test packet also comprises the information of first end node address, and described the second end node address is as the source address of described test packet, and described first end node address is as the destination address of described test packet.
10. system according to claim 8 is characterized in that, described construction unit comprises:
Make up subelement, be used for making up test packet, described the second end node address is as the destination address of described test packet;
The interface subelement is used to described test packet to specify outgoing interface;
Send subelement, be used for by described outgoing interface described test packet being sent to described first end node.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010521265 CN101958810B (en) | 2010-10-27 | 2010-10-27 | Method and system used for realizing fault positioning of intermediate node autonomously |
| PCT/CN2011/075189 WO2011144158A1 (en) | 2010-10-27 | 2011-06-02 | Method and system for independently implementing fault location by intermediate node |
| EP11783075.2A EP2557731B1 (en) | 2010-10-27 | 2011-06-02 | Method and system for independently implementing fault location by intermediate node |
| US13/718,921 US9059904B2 (en) | 2010-10-27 | 2012-12-18 | Method and system for intermediate node to locate a fault independently |
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| CN 201010521265 CN101958810B (en) | 2010-10-27 | 2010-10-27 | Method and system used for realizing fault positioning of intermediate node autonomously |
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| CN101958810B (en) * | 2010-10-27 | 2013-01-23 | 华为数字技术有限公司 | Method and system used for realizing fault positioning of intermediate node autonomously |
| CN104796298B (en) * | 2014-01-22 | 2019-06-07 | 新华三技术有限公司 | A kind of method and device of SDN network accident analysis |
| CN103840976B (en) * | 2014-02-28 | 2017-06-20 | 华为技术有限公司 | Communication means, light device and the network equipment |
| CN110034971B (en) | 2014-05-26 | 2022-11-18 | 华为技术有限公司 | Method and device for detecting service chain |
| US10419324B2 (en) | 2015-09-30 | 2019-09-17 | British Telecommunications Public Limited Company | Analysis of network performance |
| US10320648B2 (en) | 2015-09-30 | 2019-06-11 | British Telecommunications Public Limited Company | Analysis of network performance |
| EP3360288B1 (en) | 2015-10-08 | 2019-11-06 | British Telecommunications public limited company | Analysis of network performance |
| US10608912B2 (en) | 2016-05-20 | 2020-03-31 | Volta Networks, Inc. | Troubleshooting multi-layered networks using datapath analysis |
| US10379158B2 (en) * | 2017-02-09 | 2019-08-13 | Advantest Corporation | Real-time capture of traffic upon failure for protocol debug |
| CN110290017B (en) * | 2019-07-26 | 2022-06-10 | 新华三大数据技术有限公司 | Fault node positioning method and PE equipment |
| CN112904758B (en) * | 2021-01-14 | 2022-04-26 | 北京经纬恒润科技股份有限公司 | Data return link state monitoring method and system based on unmanned vehicle |
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Also Published As
| Publication number | Publication date |
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| WO2011144158A1 (en) | 2011-11-24 |
| US9059904B2 (en) | 2015-06-16 |
| EP2557731A4 (en) | 2013-02-20 |
| EP2557731B1 (en) | 2018-08-29 |
| EP2557731A1 (en) | 2013-02-13 |
| CN101958810A (en) | 2011-01-26 |
| US20130100824A1 (en) | 2013-04-25 |
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